| 主权项 |
1. A permanent magnet canned motor pump with a corrosion-protection housing, in a high temperature, toxic, flammable and corrosive liquid transferred application, comprising a pump casing, a triangle support, an impeller, a containment shell, a stationary shaft and a canned motor, wherein
the pump casing has a flow channel, adapted for containing the impeller, an inlet, an outlet, and a front thrust ring, the front thrust ring being located on an inner surface of the pump casing and at a position near the inlet; so that the front thrust ring and a thrust bearing, which is near an inlet side of the impeller, form an axial thrust bearing together; the triangle support is fixed inside the inlet of the pump casing, and axially passes through a hub aperture of the impeller for supporting an end of the stationary shaft; the impeller is contained in the pump casing, a hub plate is connected to an axially extended part of an inner rotor, so that the impeller and the inner rotor of the canned motor are integrated as one unit; the containment shell is similar to a cup shape, of which at the center of a bottom has a blank rear shaft support axially extending inward, an outer surface of the blank rear shaft support being supported by a shaft rear metal support of a motor rear casing, the blank rear shaft support and the shaft rear metal support are closely attached to each other; and a rear thrust ring is installed on the verge of the blank rear shaft support and is mated with a ceramic bearing of the inner rotor to form the axial thrust bearing; a shell flange, which is at a front end of the containment shell, is fitted between the pump casing and a front flange of the corrosion-protection housing in order to prevent leakage of the corrosive liquid from the permanent magnet canned motor pump; the stationary shaft, which is made of corrosion-resistant and abrasion-resistant ceramic material, is supported at both opposite ends, a front end of the stationary shaft is supported by the triangle support, a rear end of the stationary shaft is supported and fixed by the blank rear shaft support; a middle part between the front end and the rear end is mated with the ceramic bearing for supporting the inner rotor, so that the inner rotor is able to rotate along the stationary shaft; the canned motor of the permanent magnet canned motor pump with the corrosion-protection housing comprises a windings stator, the inner rotor, a motor casing, the motor rear casing, and a reinforced bracket; the windings stator inserted inside the motor casing has windings wound around teeth of the windings stator, a torque is generated from a magnetic interaction between the inner rotor and the windings stator to drive the rotation of the inner rotor, and the inner rotor drives the impeller to rotate and generate hydraulic power, the containment shell protects the windings stator from corrosion caused by the corrosive liquid; the inner rotor is a ring-shape structure comprising a main magnet set, a main yoke and the axially extended part; the inner rotor is encapsulated by a corrosion resistant plastic and forms a sealed rotor resin enclosure, and the ceramic bearing is installed inside the inner rotor; the axially extended part of the inner rotor is connected to the hub plate, so that the inner rotor and the impeller are combined as a complete unit; a rear side of the motor casing is a cup shaped structure with an aperture, and the windings stator is inserted inside; the motor rear casing is circular-disc shaped having vertical cooling fins, a terminal box and the shaft rear metal support; the shaft rear metal support is axially extended inward through the aperture of the motor casing to offer support to the stationary shaft; and the windings stator are electrically connected to terminals of the terminal box by wire passing through the aperture; and the reinforced bracket is a column with an opening at both ends, made of corrosion resistance plastic, a bottom part of the reinforced bracket is a blanket foot plate which is a flat plate; the reinforced bracket comprises a ring rib dividing an inner space of the reinforced bracket into a front inner space and a rear inner space; the motor casing fitted in the front inner space and the motor rear casing fitted in the rear inner space are combined as a complete unit as the corrosion-protection housing, which features: the front flange of the corrosion-protection housing is formed by a bracket front flange of the reinforced bracket and a pump side flange of the motor casing; and tapped holes are formed on the front flange for tightly combining to the pump casing, and the front flange is against a back side of the shell flange of the containment shell for sealing and for preventing the leakage of corrosive liquid from the permanent magnet canned motor pump; a front end of the reinforced bracket pressing against the pump casing is adapted to prevent permeation of chemical drops; the corrosion-protection housing is mounted by a blanket foot plate of the reinforced bracket; in addition, the reinforced bracket is long enough so that a rear end of the reinforced bracket covers the terminal box and the cooling fins of the motor rear casing. |
